Apparatus for detecting failure in power system

Abstract

At both ends parts of a specified section of a high tension line and close to it, a first Faraday device and a second Faraday device are disposed, and an output end of the first Faraday device is connected to the input end of the second Faraday device through a polarization plane retaining type optical fiber. A light having a linear-polarized polarization plane is inputted from a polarizer to the input end of the first Faraday device. The light output from the second Faraday device is led through an analyzer to a photoelectric device, whose output is processed by an electric circuit consisting of only one band-pass filter, only one DC filter, only one divider, and a judgment circuit.

What is claimed is: 
     
       1. An apparatus for detecting failure in power system comprising: a first Faraday device disposed close to a high tension line at a position of one end part of a specified section of said high tension line,   a second Faraday device provided close to said high tension line at a position of the other end part of said specified section,   a polarization-plane-retaining optical fiber which connects output end of said first Faraday device and input end of said second Faraday device,   a light-emitting device disposed at a position of the ground potential,   a polarizer which produces a linear-polarized light from a light emitted by said light-emitting device and inputs said linear-polarized light to said first Faraday device,   an analyzer which analyzes a linear-polarized light outputted from said second Faraday device,   a photoelectric device disposed at the position of the ground potential and converts light outputted by said analyzer into electric signal, and   a judgment circuit for judging existence of failure of said high tension line by computing information of said electric signal.   
     
     
       2. An apparatus for detecting failure in power system in accordance with claim 1, wherein said polarizer is disposed at the position of the ground potential and   output end of said polarizer is connected by a polarization-plane-retaining optical fiber to input end of said first Faraday device.   
     
     
       3. An apparatus for detecting failure in power system in accordance with claim 1, wherein said polarizer is disposed close to said high tension line and at the vicinity of said first Faraday device so as to receive output light of the latter to input end of the former.   
     
     
       4. An apparatus for detecting failure in power system in accordance with claim 1, wherein said analyzer is disposed at the position of the ground potential and   output end of said second Faraday device is connected by a polarization-plane-retaining optical fiber to the input end of said analyzer.   
     
     
       5. An apparatus for detecting failure in power system in accordance with claim 1, wherein said analyzer is disposed close to said high tension line and at the vicinity of said second Faraday device so as to receive output light of the latter to input end of the former.   
     
     
       6. An apparatus for detecting failure in a power system comprising: a first Faraday device disposed at a first end part of a specified section of a high tension line and close thereto and a second Faraday device disposed at a second end part of said specified section of said high tension line and close thereto,   a polarization plane retaining type optical fiber, through which an output end of the first Faraday device is connected to an input end of the second Faraday device,   a light producing means including a polarizer for producing a light having a linear-polarized polarization plane which is inputted from said polarizer to the input end of said first Faraday device,   an analyzer for receiving a light output signal from said second Faraday device,   a photoelectric device for receiving a light output from said analyzer and   an electric circuit for receiving an output from said photoelectric device, said electric circuit comprising only one band pass filter, only one dc filter, only one divider, and a judgment circuit.